Summary

22 items · 10–20 minutes

Why Every Pet Owner Needs a Symptom Reference

Animals cannot tell us what hurts, what feels wrong, or how long they have been uncomfortable. That gap between what a pet experiences and what an owner can observe is exactly where serious conditions can go unnoticed — sometimes until they become harder to treat.

This checklist exists to close that gap. It organizes common warning signs by urgency level, so when something seems off with your dog, cat, or other companion animal, you know immediately whether to rush to an emergency clinic, call your vet in the morning, or simply keep a closer eye on things.

For a deeper look at how animals mask discomfort, see our article on signs your pet may be in pain. And if you want to build a consistent observation habit between vet visits, our monthly at-home health check routine is a practical companion resource.

This Checklist Is Not a Diagnosis

The information here is for general educational purposes only and does not constitute veterinary medical advice. Symptoms can overlap between many conditions, and only a licensed veterinarian can properly evaluate and diagnose your pet. If you are ever unsure whether a symptom warrants a call, the safest approach is always to contact your vet and describe what you are seeing.

How to Use This Checklist

The checklist is divided into four urgency tiers. Read through all groups once so you have a mental picture of the full range of symptoms. Then, when you notice something unusual, return to the relevant section and match what you are seeing to the appropriate level of response.

Required

Digital Rectal Thermometer (pet-safe)

Allows you to check your pet's temperature at home; normal range is approximately 101–102.5°F for dogs and cats.

Required

Pet First Aid Kit

Provides basic supplies — gauze, antiseptic wipes, saline solution — to stabilize your pet before a vet visit.

Optional

Symptom Log Notebook or App

Helps you record the timing, frequency, and character of symptoms so your vet has accurate information.

Required

Emergency Vet Contact Card

Keep your regular vet's number, nearest emergency clinic address, and an animal poison control hotline number in one accessible place.

Gathering the right tools before a health crisis makes a stressful moment more manageable. Keep your emergency vet contact information where everyone in the household can find it — not just saved on one person's phone.

Owners who already know what normal looks like for their specific pet will catch deviations faster. Our guide to annual wellness exams explains what vets assess during routine visits and how those benchmarks help establish your pet's healthy baseline.

The Symptom Checklist, by Urgency Level

Work through the groups below from top to bottom. Emergency signs always take priority — if your pet shows any symptom from the first group, stop reading and act immediately.

Emergency — Seek Care Immediately

Contact an emergency veterinarian right away if your pet collapses, loses consciousness, or cannot stand. Must
Call your vet or an emergency clinic immediately if your pet is struggling to breathe, gasping, or breathing with an open mouth (especially in cats). Must
Seek emergency care if your pet is having a seizure or has had one for the first time. Must
Go to an emergency vet if your dog has a visibly distended abdomen, is retching without vomiting, or shows signs of bloat. Must
Act immediately if you suspect your pet has ingested a known toxin, medication, or poisonous plant. Must
Seek urgent care if your pet is bleeding heavily and the bleeding cannot be controlled with gentle pressure. Must

Urgent — Call Your Vet Within 24 Hours

Call your vet if your pet has vomited or had diarrhea more than twice in a single day, or if there is blood in either. Must
Schedule a same-day or next-day appointment if your pet has not eaten for more than 24 hours (dogs) or 12–24 hours (cats). Must
Report sudden, significant lameness or an unwillingness to bear weight on a limb to your vet promptly. Must
Notify your vet if your pet is straining to urinate, producing little to no urine, or crying out during urination — this can indicate a life-threatening blockage. Must
Contact your vet if your pet's eyes appear red, cloudy, discharge-coated, or if the animal is pawing at or squinting an eye. Should

Monitor and Schedule — Watch Closely, Book Soon

Schedule a vet visit if you notice unexplained weight loss or gain over several weeks, even if your pet seems otherwise normal. Should
Book an appointment if your pet is drinking significantly more or less water than usual for more than two days. Should
Report persistent coughing or sneezing that lasts more than a few days, particularly if accompanied by nasal discharge. Should
Have your vet evaluate any lumps, bumps, or skin changes you discover during routine handling or grooming. Should
Flag noticeable changes in your pet's coat — excessive shedding, bald patches, or a dull, flaky coat — at your next appointment. Should

Behavioral Changes — Track and Report

Note any sudden increase in aggression, fearfulness, or withdrawal from human contact and mention it to your vet. Should
Track unusual lethargy or a significant drop in activity levels that lasts longer than one to two days. Should
Record instances of excessive vocalization, restlessness at night, or repetitive behaviors that are new to your pet. Nice to have
Monitor your pet's litter box or bathroom habits and report any sustained changes in frequency, consistency, or effort. Should
Keep a simple written log of symptoms with dates so you can give your vet an accurate history during the appointment. Nice to have

Cats Hide Illness More Than Dogs

Cats are instinctively inclined to mask signs of pain or illness, so symptoms often appear later and more severely than in dogs. If a cat stops eating, becomes unusually withdrawn, or changes litter box behavior, treat it as a prompt to call your vet rather than a wait-and-see situation. Early detection is especially important for cats. See our guide to easy-to-miss pain signs for more detail.

Urinary Blockages Are a True Emergency

Male cats in particular are highly susceptible to urethral blockages, which can become fatal within 24 to 48 hours if untreated. Straining in the litter box without producing urine, or producing only small drops, should never be written off as constipation. Go to an emergency vet clinic immediately if you observe these signs.

Behavioral changes are among the most commonly dismissed early warning signs. Research consistently indicates that owners who track subtle shifts in behavior are better positioned to catch conditions early. Our related article on when pet owners wait too long to call the vet details the real consequences of delayed care.

If you notice behavioral symptoms alongside physical ones, that combination warrants faster action. See our overview of stress signs in pets to help distinguish stress-related behavior from pain or illness.

This article is for general informational and educational purposes only and does not constitute veterinary medical advice. Always consult a licensed veterinarian for guidance specific to your pet's health and situation.

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Pets & Animals Editorial Team · Contributor

Pets & Animals Editorial Team is the collective byline for our editorial team and contributor network. Articles published under this byline or an editorial pen name are researched, written, and reviewed according to our editorial standards for clarity, consistency, and independence before publication.

The content on this site is provided for informational purposes only and should not be considered a substitute for professional advice. While we strive to provide accurate and up-to-date information, we make no guarantees regarding its completeness or accuracy. Always consult a qualified professional for advice specific to your circumstances before making any decisions.